Buttonhole sewing machine



Oct. 6, 1936. EB, ALLEN ET AL 7 2,056,758

BUTTONHOLE SEWING MACHINE Filed Dec. 26, 1954 18 Sheets-Sheet l Edward cflllen/ /Vaurice 0. Know ilma? W 1 i7? f W Oct. 6, 1936.

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1936- E. B. ALLEN ET AL BUTTONHOLE SEWING MACHINE Filed Dec. 26, 1934 18 Sheets-Sheet 3 NWN Iakzzardb. flllen/ t/vauriceflfinaz Oct. 6, 1936. ALLEN ET AL 2,056,758

BUTTONHOLE SEWING MACHINE Filed Dec. 26, 1934 18 sheets-sheet 4 Oct; 6, 1936. E B ALLEN ET AL 2,056,758

BUTTONHOLE SEWING MACHINE Filed Dec. 26, 1954 18 Sheets-Sheet 5 Oct. 6, 1936. E. B. ALLEN ET' AL 2,056,753

BUTTONHOLE SEWING MACHINE Filed Dec. 26, 1954 18 Sheets-Sheet 6 Oct. 6, 1936.

E. B. ALLEN Ei' AL BUTTONHOLE SEWING MACHINE Filed Dec. 26, 1934 18 Sheets-Sheet '7' 3 M Ida/an? 5 uflle a Maurice flKnox- Kath/MM Oct. 6, 1936. B, ALLEN ET AL 2,056,758

BUTTONHOLE SEWING MACHINE l8 Sheets-Sheet 8 W H 3. a Z d l a Quinta/c05 Oct. 6 1936. 4 E ALLEN ET AL 2,056,758

BUTTONHOLE SEWING MACHINE Filed Dec. 26, 1934 v 18 Sheets-Sheet 9 22 I 4 1 .256 aez 163 Z66 144 V Z1? 17.9 214 IHIII I t 6, 1935 E. B. ALLEN ET AL BUTTONHOLE SEWING MACHINE l8 Sheets-Shet 10 Filed Dec. 26, 1934 GUM/mu;

g YVU MVLODO Edward B-UQZZQIT/ Oct. 6, 1936. E. B. ALLEN ET AL V 2,056,758

BUTTONHOLE SEWING MACHINE Filed Dec. 26, 1954 18 Sheets-Sheet 11 Wi ma Oct. 6, 1936. E. B. ALLEN El AL BUTTONHOLE SEWING MACHINE Filed Dec. 26, 1954 18 Sheets-Sheet 12 Oct. 6, 1936. E. B. ALLEN ET AL 2,056,758

BUTTONHOLE SEWING MACHINE Filed Dec. 26, 1954 18 Sheets-Sheet 1S ammo Edward BM QZZen "Z/Haaro'ce B. [(720.27

Oct. 6, 1936. E. B. ALLEN ET AL BUTTONHOLE SEWING MACHINE 18 Sheets-Sheet 14 Filed Dec. 26, 1934 Edwan? iiflllen) Jlaw 'zlce D- Knox H lllll 6% @n mm. Na

0611- 6, 1936- E. B. ALLEN ET AL BUTTONHOLE SEWING MACHINE Filed Dec. 26, 1934 18 Sheets-Sheet 15 Gum/"M3 Oct. 6, 1936. E. B. ALLEN ET AL BUTTONHOLE SEWING MACHINE Filed Dec. 26, 1934 18 Sheets-Sheet l6 Oct. 6, 1936. E ALLEN ET 2,056,758

BUTTONHOLE SEWING MACHINE Filed Dec. 26, 1954 1a Sheets- Sheet 17 V Z1 //4 3 mgg gymw Oct. 6, 1936. E. B. ALLEN ET AL BUTTONHOLE SEWING MACHINE Filed Dec. 26, 1954 18 Sheets-Sheet l8 Patented Oct. 6, 1936 UNITED STATES PATENT OFFICE BUTTONHOLE SEWING MACHINE Edward B. Allen and Maurice D. Knox, Newtown, Conn., assignors to The Singer Manufacturing Company, Elizabeth, N. J., a corporation of New Jersey Application December 26, 1934, Serial No. 759,200 22 Claims. (01. 112-73) This invention relates to buttonhole sewing the machine. Fig. 9 is a vertical section through machines, more particularly of the automatic the pendulous needle-bar carrier or gate. lock-stitch straight type, commonly used for Figs. 10 and 11 are r sp tiv ly a d face sewing buttonholes in white goods such as mens and vertical sectional views of the needle-thread 5 shirts, collars, cuffs and the like. tension device shown at the lower end of the In United States Patent No. 1,966,432, of July bracket-arm head in Fig. 8. Fig. 12 is a horizon- I7, 1934, there is disclosed rotary-hook locktal sectional view through t overhanging Stitch mechanism capable of so handling the bracket-arm of the machine. Fig. 13 is a section needle-thread loops and bobbin-thread that pyrn e e 3 14 is a e n 1.0 amid purl buttonholes may be accurately sewn at on t e line 15 is e p p l9 rates as high as 3000 stitches per minute. tive V Of the actuating Gem of the pp An object of the present inventio is t prothread-cutter and -nipper release mechanism. vide an automatic straight buttonhole sewing 16 is a p View Of the forward end p machine, the various cooperative parts and de- 111011 of the machine bed With the Work-Clamp 5. vices of which are so improved and coordinated remevedis a vertical S t through l5. as to be commensurate in emciency and peed machine bed and bracket-arm Standard on with the rotary hook and bobbin-thread-handling the e Fig. 1. Fig. 18 is a section on mechanisms of said Patent No. 1,966,432, with the line '19 is a disassembled hi h th are caused t work in harmony elevation of certain small parts shown in Fig. 16.

20 With the above and other objects in view, as 20 is a left side elevation Partly in 20 will hereinafter appear, the invention comprises tion, of the connections with feed'cam for the devices, combinations, and arrangements of parting to the Work-clamp its traveling move" parts hereinafter set forth and illustrated in the F m kmgthwise the machine 21 accompanying drawings of a preferred emb di 1S a'se ctmn On the hne 16. is

ment of the invention, fromwhich the several a honzontal Section on 11 ne 1, 25

1 features of the invention and the advantages atb on scam 1s sectlol? on i tained thereby will be readily understood by those lme f 24 1S Perspectlve Skilled in the am of the inner face of the needle-b-ar-vibrating In t p y g drawings 1 a Crank-head shown In FlgS. and 23. Flg.

side elevation, partly in section, of a buttonhole sewing machine embodying the invention.

Fig. 2 is a left side elevation of the machine.

Fig. 2 is a similar view of the mechanism at the lower end of the tilting stop-motion lever for the sewing mechanism of the machine showing such 1s a section on the line 2929, Fig. 3.

g g g i fi ig t g g zgg 2:12:22 Fig. 30 is a fragmentary vertical section on the F1 3a is a detail bottom plan View of a part line titl -30, Fig. 1. Fig. 31 is a longitudinal ver- 3 4 h t 1 1 tical sectionthrough the forward end-portion of 15 Onzon Sec Iona mew the needle-throat-plate of the machine, showing 10 thtough bracket'am} Standard of the under nipper for the needle-thread; the nip- Fhme, ShQWmg machme m plan per being open or in position to receive the needle detall plan the t onitsfirSt descent in the sewing of a buttonhole.

ing bracliet shown in Fig. 4. F1g.4 1s a section Fig 31a is a Similar View Showing the mppr 45 on lme 5L4)! g g- 5 1s end closed onthe beginning end of the needle-thread 45, elevatlon of the machme- Is dlsas' after the needle has risen clear of the work and 4 sembled perspective view of a connection between the takemp 1ever has reached the t of its fir t the top of t esewing stop-mo io l and a up-stroke. 'Figj32 is a transverse section through latch-trippi e rod for the upper thread-Cutter the throat-plate on the line 32-32, Fig. 31. Fig.

5e and -n pp r r l e m ni m. Fi 5b is a d 33 is a section substantially on the line 33-33, 50

tail sectional view of an element of Fig. 5. Fig. 6 Fig, 4, Fig, 34 is airagmentary vertical section is a face View Of t S w S opo io buffer longitudinally of the machine bed at the rearspring and its carrier. Fig. 7 is a perspective ward end thereof adjacent the bracket-armview of the notched stop-cam of the sewing stopstandard on the line i l-34, Fig. 3. Fig. is

is a perspective View of the cam which controls the field or center line of vibration of the needle. Fig. 27 is a transverse vertical section through the machine bed on the line 2l2'l, Fig. 4. Fig.

35 28 is a section on the line 2828, Fig. 16. Fig. 29 35 is a bottom face view of the feed-cam. Fig. 26 30 motion device. Fig. 8 is a front end elevation of a similar sectional view on the line 35-45, Fig. 3. 5?

Fig. 36 is a horizontal sectional view through the one-rotation clutch mechanism for driving the auxiliary shaft of the machine which drives the work-clamp closing and. opening mechanism the buttonhole-cutting mechanism and various other mechanisms auxiliary to the stitch-forming mechanism in the buttonhole producing cycle. Fig. 37 is a face view of the driven or bottom element of the clutch shown in Fig. 36. Fig. 38 is a face view of the live or top clutch-element shown in Fig. 36. Fig. 39 is a perspective view of the clutch-controlling gate.

Fig. 40 is a disassembled perspective View of parts of the driven clutch-element. Fig. 41 is a longitudinal vertical sectional view through the work-clamp, showing the operating mechanism for the upper thread-cutter and -nipper. Fig. 42 is a section on the line 42-42, Fig. 41. Fig. 43 is a section on the line 4343, Fig. 42. Fig. 44 is a section on the line 44-44, Fig. 2. Fig. 45 is a section on the line 45-45, Fig. 44. Figs. 46, 47 and 48 are, respectively, transverse vertical sectional views on the lines 46-46, 41-41 and 4848, Fig. 16. Fig. 49 is a sectional view on the line 4949, Fig. 16.

Fig. 50 is a vertical sectional view through the front hook-shaft bearing showing the. bobbinthread pull-off driving connections. Fig. 51 is a fragmentary. left side elevational View of the clamp closing-and-opening and buttonhole-cutting mechanisms. Fig. 51 is a sectional view of the element of Fig. 51. Fig. 52 is a top plan view of the rotary hook and bobbin-thread pull-off devices. Fig. 53 is a fragmentary right side elevation of the needle, rotary hook and bobbin-thread pull-off devices. Fig. 54 is a perspective view of the bobbin-thread-nipper and -cutter. Fig. 55 is a perspective view of the latch which controls the opening and closing movements of the bobbin-thread-nipper and -cutter. Figs. 56 and 56 are, respectively, top and bottom perspective views of the throat-plate. Fig. 57 is a' disassembled perspective view of the under needle-thread-nipper. Fig. 58 is a top plan view of the bobbin-threadnipper and -cutter advancing and opening to seize and cut the bobbin-thread at the end of a sewing period. Fig. 59 is a front elevation, partly in section, of the parts shown in Fig. 58.

Fig. 60 is a view similar to Fig. 58 with the bobbin-thread-cutter and -nipper almost fully advanced and about to close. upon the bobbinthread. Fig. 61 is a front elevation, partly in section, of the parts shown in Fig. 60. Fig. 62 shows the bobbin-thread-cutter and -nipper fully advanced and closed upon the bobbin-thread. Fig. 63 is a front elevation, partly in section, of the parts'shown in Fig. 62. Fig. 64 shows the closed bobbin-thread-nipper and -cutter, fully retracted to pull off a measured length of bobbinthread for the beginning of the next sewing operation. Fig. 65 is a front elevation, partly in section, of the parts shown in Fig. 64, the bobbinvthread-cutter and -nipper being also shown in dotted lines in its subsequently partially advanced position to slacken the bobbin-threadso that it may be easily pulled to position in the work by the first needle-loop to be tightened in the next sewing operation. Fig. 66 is a transverse section through the bobbin-thread-cutter and -nipper. Fig. 67 shows the parts of the needle-thread-controlling mechanism at the end of a sewing period, and Fig. 68 is a similar view of the parts at the start of the next buttonhole producing cycle.

Frame The machine frame comprises a box-like bed or casing I on top of which is secured the standard 2 of the overhanging bracket-arm 3 terminating in the head 4. The space above the bed I and under the overhanging portion of the bracketarm 3 constitutes a work-receiving throat and it is within this throat that the work-clamp of the machine is customarily mounted for step-by-step traveling movements longitudinally of the bed I to distribute the stitches lengthwise of the buttonhole being produced. The present work-clamp is so constructed that almost the entire depth of the throat of the frame is available for reception of work and the machine is thus well adapted for sewing buttonholes in shirt bosoms. The standard and bracket-arm have open sides and coplanar inner vertical webs 2, 3', the open sides being closed by removable cover-plates 3 and 3*, Fig. 17.

Stitch-forming mechanism The main sewing shaft 5 of the machine is journaled in the bracket-arm 3 and at its forward end carries the usual crank 6 connected by the link I to the reciprocatoryneedle-bar 8 carrying the eye-pointed needle 9. The needle-bar 8 is mounted for endwise reciprocation in the pendulous carrier or gate I0, Figs. 8 and 9, suspended from the pivot I I and vibrated transversely of the bracket-arm 3 by mechanism to be described.

Mounted on the main sewing shaft 5 is a bevelgear I2, Fig. 1, which meshes with the bevel-gear I2 fixed to the vertical shaft I3 to the lower end of which is fixed the bevel-gear I4 meshing with the bevel-gear I5 on the lower horizontal shaft I6 carrying at its forward end the rotary hook I1 which cooperates with the needle 9 to form stitches.

The rotary hook I'I embraces the stationary bobbin-case I8 which is journaled within it and is restrained against rotation by the independently oscillatory fingers I9, 20, Fig. 8, received in the notches 2|, in the thread-case. The bobbin-case I8 carries the usual bobbin 22 of '"under thread. The fingers I9, 20 are carried by the respective parallel rock-shafts 23, 24 which are oscillated one at a time, to clear the bobbin-case in the loop-casting operation,by the respective camfollowers 25, 26 in engagement with the respective cams 21, 28 on the cam-shaft 29 connected by gears 30 to the hook-shaft I 6' to run at half the speed of the latter. The, present rotary hook and bobbin-case devices, as well as the cam-mecha nism for operating the op-enable rotation-restraining fingers I9, 20 are constructed substantially in accordance with the disclosure of said U. S. Patent No. 1,966,432. While any of the usual loop-taking mechanisms may housed, the particular loop-taking mechanism disclosed is preferred because of the extreme ease and freedom with which theneedle-loops are passed thereby around the bobbin-case at high operative speeds. I Y

The vertical sewing shaftI3, Fig. 18, carries a pinion 3I which .drivesthegear'32. onthe short vertical shaft.33 to the lower .end Lofwhich is fixed the head '34 carrying the diametrically opposed pins 35 which mesh with and impart stepby-step impulses to. the radially slottedstar wheel 36,..Figs; .1 and 12, fast on the vertical shaft 31. The shaft 37 has detachably fixed to its lower end a stitch-gear 38, .Figs. land 22, of any desired diameter meshing .withagearfia concentric with 

